W.M. Zhang
,
M.J. Hu
,
Y.J. Li
,
J.S. Pan and X. Chen( 1) Open Lab. of the Educational Ministry for High Temperature Material and Test
,
Shanghai Jiaotong University
,
Shanghai 200030
,
China 2) Oregen Graduate Institute of Science and Technology
,
USA)
金属学报(英文版)
According to computer numerical simulation for measuring atmosphere carbon potential by electric resistance method (hot-wire method) and the experimental data, the paper point out that the measuring result dose not directly reflect the atmosphere carbon potential (Cg) but the average carbon content, and as a result, the change of electric resistance obviously lag to that of the atmosphere carbon potential. In order to correctly control the carbon potential by electric resistance method, the authors bring forward a function which is a better expression for the relationship between the average carbon content of the wire and the atmosphere carbon potential and ensures good carbon potential control.
关键词:
electric resistance method
,
null
,
null
Y.J. Li
,
J.S. Pan
,
M.J. Hu
,
D. Tian and W.M. Zhang Open Laboratory of the Educational Ministry for High Temperature Materials & Tests
,
Shanghai Jiao Tong University
,
Shanghai 200030
,
China
金属学报(英文版)
When FEM is utilized to simulate the quenching process of the workpiece and realize the coupled calculation of the temperature field and phase transformation, due to the effect of the complex shape, non-linear physical parameters and the latent heat during phase transformation, the element selection should be done cautiously so that end results can meet the actual situations. In this paper through comparing the different type and density of elements, the eight-node, hexahedral, isoparametric element is found to be a good choice. Using this kind of element can not only meets the need of calculating accuracy, but also cut down the calculating magnitude and takes full advantage of the hardware source. In addition, the effect of distorted elements on the calculation result has also been discussed in this paper.
关键词:
FEM
,
null
,
null
